Hi all,
As I mentioned in my posts in 2024 I have the same vibrations as everybody else and at the same speeds. I have a GT line Launch Edition. I live in The Netherlands. What I know:
1) It has nothing to do with tires. In the Netherlands the car does not come with Kumhos but with Continental. I have switched all tires to bridgestone winter tires and problem is still there.
2) Balancing doesn't seem to help. I sent the car to the dealership and they said wheels were out of balance. Still, I could see in the app they had not driven the car. When I tried it, problem was still there. Brought it back to the dealership.
3) I have only read of one person that changed the wheels and it went away (see post above by UlmVT ) . Others have changed wheels and tires and problem persisted.
4) It is very suspicious that the vibrations are reported to be at exactly the same speeds by everyone. The videos I have seen are exactly what I experience. This suggests the problem comes from somthing common to all or many cars. Unlikely to be tires or so as different countries use different brands and the problems are reported in Sweeden, France, The Netherlands, USA, etc.
5) Some other KIAs had similar problems (even non-ev) and it was related to the drive shaft. I know nothing about mechanics though.

Will wait to see what the dealership does this time, but I am not hopefull as one of the mechanics there told me that they know about the issue and there is no solution.

Please....someone tell me you have found a solution!!.

 

Mine does not have it, others have had success with lateral supports. I e. Fsome.foam between seat and console.

 

Hi, I have the same problem I think. Replaced with new winter tires and still vibrations. Is your problem solved?

T

Hi, I have the same problem I think. Replaced with new winter tires and still vibrations. Is your problem solved?

there is NO solution. It’s the design of chasis and motors. My solutions was eating about 30k and trading in on a 2025 5N. Best decision ever made.
there

 

T
there is NO solution. It’s the design of chasis and motors. My solutions was eating about 30k and trading in on a 2025 5N. Best decision ever made.
there

Some people say they solved it and many don't seem to have the problem in the first place. When I tested one before getting mine, the test model did not have this problem.

 

My dealer here in south west Florida opened a tech line case with Kia HQ a week ago and is waiting for their further instructions. They told me so far that one of the rims is out of round. Luckily , while they are waiting for that tech line response they gave me the vehicle back, so no need for it to stay at dealership without actually being looked at.
This week I decided to go to a 3rd party tire shop that has Hunter Elite balancer,and they could not bring the road force balanced values below 16 on 3 out of 4 tires Initial road force values were about 26-30, so not saure how dealership actually road force balance them. That tire shop only managed to bring down 1 tire to road force value of 2. But then I test drove it and it was the same vibration if not worse on the highway...
I went to my dealer right after this and told them that tires are bad, to which they responded that they need authorization for any further action from Kia HQ. I think it could be out of round wheels ( rims) that cause vibration, for those cases when tire changing didn’t help some people, based that my Land has one defective rim, according to to my dealer.
The central console vibration can be solved by foam, but I don’t think that will do anything with the wheel vibration.

 

My dealer here in south west Florida opened a tech line case with Kia HQ a week ago and is waiting for their further instructions. They told me so far that one of the rims is out of round. Luckily , while they are waiting for that tech line response they gave me the vehicle back, so no need it to stay at dealership without actually being looked at.
This, week I decided to go to a 3rd party tire shop that has Hunter Elite balancer, they could not bring the road force balanced number below 16 on 3 out of 4 tires. Only one tire they managed to bring down to 2 road force value. But then I test drive and it was the same vibration if not worse.
I went to my dealer right after this and told them that tires are bad, to which they responded that they need authorization for any further action from Kia HQ. I think it could be out of round wheels ( rims) that cause vibration, for those cases when tire changing didn’t help some people, based that my Land has one defective rim, according to to my dealer.
The central console vibration can be solved by foam, but I don’t think that will do anything with the wheel vibration.

Complete waste of time. It’s not the wheels. It’s not the tires. It’s the chassis and motors. There is NO fix. That vibration is a result of NORMAL vehicle dynamics for the EV9. Tech case was open on mine for 4 months with kia engineers inspecting vehicle from corporate in cali. Live with the vibrations or trade it in as I did is the ONLY solution. And they will NOT buy it back because vibrations are considered normal and no lemon law firm will take case because kia deemed “normal” and not a defect.

 

That is a pretty sad outlook. Mine is a lease and it's just 3rd month now out of 36. Don't wanna pay ~$25K early lease termination fee for sure
If it's chassis and motors, why do then most of EV9 owners don't have that issue?

 

I know there are pages and pages on the vibration issue and it seems to point to foam coming off inside the tires and at least in those cases were the foam was removed, the issue resolved. I know also there are other theories being discussed in this thread and on the web.

The begging Q I have, why would someone have to live either with loud noisy ride if foam is removed or tire replaced with non-foam tires, why is re-glueing the foam back in not discussed as an option? I’m not sure if I’m missing something on the glueing part or not? Thx

 

You’re missing a lot. #1 if foam separates the manufacturer will replace all tires for free. I’d do that Three times. #2 the foam will only seperate again in the new tires. #3 driving tiered with no foam, I did that, drastically increases road noise. Which defeats a purpose of the vehicle which has bank vault like silence when driving. #4 the tires vibrating is ONE source of vibration. There is ANOTHER source yet not discovered. This source causes the severe floor and seats and console to vibrate apart. Per KIA engineering and TECH LINE. THIS IS A NORMAL VEHICLE CHARACTERISTIC OF THE EV9. *meaning it’s NORMAL result of vehicle design. Meaning there is NO FIX. KIA will do NOTHING. For SIX months I battled with Irvine California and their engineers and with Attornies. End result —> nothing. As I’ve stated take a kick in the nuts and trade it in yes you’ll lose around 30k because they’re with jack shit. Go buy an ionic 5N as I did and the smile will never leave your face and rid your self forever of the EV9 turd.

 

Mine has no vibration issue.

 

It does your just not observant enough to notice. It’s between about 63 mph up to around 78mph only. Not slower and not faster. Some people only drive around town never hitting 60mph thus never experience it. Some people fly thru 80mph on highway and not in that constant 63-78mph to feel it. But it’s there. All EV9’s have this vibration per field engineering out of Irvine California. He came to Las Vegas and worked in serviced department of kia dealer. He said vibrations normal for ev9 and after four months closed tech line case. As I’ve noted we have 5 kia dealers here. They can’t give the EV9’s away so during the 4-6 months I drove at least 30 new all trims. With sales managers and service managers sitting in passenger seat. THEY ALL HAVE VIBRATIONS.

 

You’ve driven every EV9 in existence? Wow.

I know a lot of them vibrate, and the issue is real. But mine doesn’t.

 

I have no such vibration and the speed limit here is 70mph so we drive at that speed.

I used to have a oscillation that started at 63mph and got worse the faster you went and felt only in the steering wheel but this was resolved in the first 1000 miles and Kia had a TSB about it being flat spots from shipping, after around 300 miles it stopped.

Here the car is provided with Continental tyres.

 

Anyone on the forum attempted to re-glue the tire insulation foam? Can you please share your experience? Tips on how you did it ? Did it work or not? helped solve or reduce your tire related vibration?

 

Anyone of the forum attempted to re-glue the tire insulation foam? Can you please share your experience? Tips on how you did it ? Did it work or not? helped solve or reduce your tire related vibration?

It cant be done, only a reglue of a section i.e. after a patch. Some tyres have "uncured" style adhesives that cant be repaired at all.

 

I had the same issue through 1,000 miles, then it pretty much stopped. Not noticing it any more at 6,500 miles.

 

I’m at 7k miles and it has vibrated since day 1. 2 balances and 1 alignment. Dealer thinks uneven tire wear and new tires are needed. I’m not paying out of pocket for 4 new tires when they’re all at 7/32.

 

Maybe some potential discovery here after collecting vibration data my 2024 GT-Line, which has 5000 miles and 2 unsuccessful road force balances. Bear with me while I nerd out with a little mechanical engineering. With an iPhone app called Vibration Analyzer the phone's x-y-z accelerometer data can be exported at up to 100 hz and frequency and magnitude of vibration can be plotted in the form of an FFT (see the attached screen shot from my vehicle test). I placed the phone on the lower console near the floor, set the cruise at 75mph on a smoothish road, and pressed record for more than 10 seconds to collect enough samples. What I found was confirmation that 13.7 Hz (our vehicles tire rotation frequency at 75mph) was present (0.007 G's), but VERY interestingly the second harmonic which is 2 times tire frequency 27.3 Hz was actually much higher (0.031 G's). This implies the wheel or tire is out-of-round in an elliptical pattern (aka second nodal diameter) which cannot be balanced. Balance affects only mass eccentricity or off-center of the tires perimeter with respect to the bearing centerline. I suspect that it could be the rims, since many here have changed the tires to no avail. I'm also 99% confident that 2nd harmonic doesn't just imply 2 tires out-of-balance, as that should just effect magnitude of vibration not frequency. Finally, the motors I think are unlikely since they would not produce 2X tire frequency, rather they would create ~10.65-13.6X higher due to the gear ratio. Interested to hear what other find out if they should try the same app, or in their other cars.

 

Once again they replaced my rims and tires 6 new sets road force blanced <12. It’s not the rim or wheels or tires.

 

RFB doesn’t cover this condition of second harmonic so that number is meaningless. Also what if they have a systemic issue and all set they gave you had at least one bad rim. Finally, no way for a high frequency motor to create the lower frequency 2 times tire per rev response. What RFV Means to the Tire Industry, Part 1 - Tire Review Magazine.

 

My 2024 GT-Line just got officially lemoned for a full manufacturer's buy back. Five dealership visits that included a tech sent from Kia America could not resolve the vibration issue (center console and steering wheel at highway speeds). Kia acted as if they had never heard of this issue before and did all the usual fixes (tire balance, tire rotation, tire replacement, alignment) to no avail. I got the BBB involved and while it took two separate hearings and inspections, Kia finally was ordered to take the car back. This was a 10 month process. The silver lining is that I received a full refund meaning I drove the car for free.

 

Great job. Regardless of what some say EVERY SINGLE EV9 has this issue. Most could not tell they ran an elephant over thus feeling vibrations they just can’t feel. Remarkably the 2026’s are doing the same damn thing lol. Just stay away from these turds. EV’s r dying anyways since the start of this thread. V8’s coming back. Credits and rebates going away. The experiment failed..

 

It’s failed. I own a 5N. If this car with 600 miles on it is worth as trade in approx 38k. Their worthless. And in MOST parts of the Country there is still no charging. I’m in vegas. I am surrounded by 6.6kw chargers lol. In another year we will all look back and ponder how the heck we all fell for this crap. Yes someday in the far future another energy source will be used but in its current iteration 1% of the us population as adapted. That’s called an experiment. A failed experiment.

 

These cars are too advanced for you 😂

 

I’ve had mine in 3 times now and still the first and second harmonic of tire frequency are terrible. Because the vibration is spread across 4 tires, the balance can feel better and worse at times as the go into and out of phase. It has felt temporarily better after dealer installed new tires but either it was placebo or better initial balance/roundness u til driving on them a few hundred miles. They have replaced both sets of tires and I have measured roundness with a dial indicator. Dealer says they were “out of spec” when they replaced them, but they say Kia won’t tell them what the spec is they call with the numbers and Kia corp gives them an answer, which tells me engineering is likely triaging these individually and know that the tires are not unbalanced to any significant degree. I also measured the roundness and found full indicated runouts less than .035”, with dial indicator and both sides jacked off the floor, which is pretty good from what I can tell. I will likely go through bbb as I have lost confidence in the vehicle. Vibration is a driver fatigue issue, and also potentially masks other problems that can no longer be felt, like a lug nut coming lose. As a mechanical engineer who works on vibration, this seems to be under damped suspension, and natural frequency right in the highway speed range. Users mentioning 2026 has the same problem suggests chassis natural frequency, as Kia changed the suspension I hear. If it’s not a chassis issue Kia needs to explain this issue.